A PROCESS TO MANUFACTURE WELDABLE QUALITY STRUCTURAL STEEL FOR CHANNEL, ANGLE AND SKELP

摘要

A process for producing high strength low-alloy structural steel characterized by high strength to weight ratio, superior notch toughness and wettability. The process achieves such characteristic features of high strength low alloy structural steel by lowering carbon content, microalloying with niobium and vanadium singly or combinedly and controlled processing in the mill. The precipitates of micro alloying elements refine the ferrite grain size due to inhibition of austenite grain growth and also cause precipitation strengthening of ferrite matrix. Also in the above process by selecting an appropriate alloy chemistry and controlled processing in the mill, high yield strength coupled with superior notch toughness are obtained.